The work a tug does at walking speed
A ship approaching a berth needs more than less speed. A harbour tug puts force at the right point on the hull while rudder, wind, tide and towline limits shape the final movement.
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The long journey of a container number
A container number moves from painted steel into gate, vessel and shipment records. Its check digit catches some bad readings; the journey still depends on reliable events and a match to the box.